#include <REGX52.H>
void Delay(unsigned int xms)		//@11.0592MHz
{
	while(xms--)
	{
		unsigned char i, j;
		i = 2;
		j = 199;
			do
			{
				while (--j);
			} while (--i);
	}
}





void main()
{
while(1)
	{
	if(P3_1==0)
		{
		Delay(20);
		while(P3_1==0);
		Delay(20);
	
		P2--;	
			
		}	
	}


}